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Benzene and its derivatives.

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Ion

An atom or a group of atoms that carries an electric charge.

End Point

The point at which an indicator changes colour and a titration is stopped.

Valence Electrons

Outermost electrons of atoms, usually those involved in bonding.

Isomers

Different substances that have the same formula.

Electronegativity

A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom.

Molarity

Number of moles of solute per litre of solution.

Distillation

The separation of a liquid mixture into its components on the basis of differences in boiling points. The process in which components of a mixture are separated by boiling away the more volitile liquid.

Excited State

Any state other than the ground state of an atom or molecule.

Mixture

A sample of matter composed of two or more substances, each of which retains its identity and properties.

Suspension

A heterogeneous mixture in which solute-like particles settle out of solvent-like phase some time after their introduction.